Panaji, Sep 1 - Ninety-one out of the 103 operators of leased mines in Goa are under the government scanner for possible violation of environmental norms, a senior official said Tuesday.

Of these, 78 operators had been issued notices to submit official documentation and details of clearances submitted to the environment and forest ministry, said Goa State Pollution Control Board chairman Simon de Souza.

'This is apart from the 13 stop-work orders we issued to operators who are mining without clearances from the forest department and the chief wildlife warden,' de Souza told reporters here.

The 78 mining lease operators have been asked to submit relevant documents within 15 days or face closure.

'It is observed that you are required to obtain approval from the chief wildlife warden and clearances under the Forest Conservation Act.